Using the uncertainty relation, find the number of free electrons with energies in the interval (E,E + dE) in the metal at temperature T = 0. The metal has the shape of a rectangular parallelepiped with volume V. When determining the number of quantum states of an electron in a given energy interval, assume that they are physically different only those states in which the momentum projections differ by no less than Dрх = 2пh/lx, lx is the edge of the “box” of volume V (similarly for Dру and Dpz).

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